地平式望远镜轴系误差对指向精度和跟踪精度的影响

Effects of the Shaft Error of an Altazimuth Telescope on Pointing and Tracking Accuracies

采用球面几何的方法推导轴系位置误差对地平式望远镜指向、跟踪精度影响的计算模型。介绍2米级地平式望远镜轴系误差检测及数据处理方法。通过对目标星体指向、跟踪仿真,得到轴系位置误差对指向、跟踪精度影响规律,为轴系精度及轴系位置要求提供理论依据,并为后续控制修正提供参考模型。

It is a new tread to use altazimuth telescopes to increase diameters of modem astronomical telescopes. This paper adopts the spherical geometry to deduce how the shaft error of an altazimuth telescope affects its pointing and tracking accuracies. We describe the detection of the shaft errors of 2m-class telescopes and the processing of such detected data. This paper evaluates the impact of shaft error on pointing and tracking from simulations of pointings and trackings of a target star under the influence of the shaft error. The evaluation can provide theoretical basis for the requirements of the alignment of telescope axis, and provide reference for followed-up corrections of control systems.